There are a variety of scents and ways to produce them.
Simmer pots (spices in a pot of boiling water), Potpourri. Put a few drops of essential oil on your furnace filter each time you change it. Put a few drops of your favorite essential oil on some on cotton balls that you can hide in drawers, on shelves or between the seat cushions on the couch.
Fresh flowers, dryer sheets.

Deodorizing disks will stop bad smells in smaller places like in a shoe closet, in the laundry basket or under your sink.

Problems with some air fresheners:
Many air fresheners (aerosol sprays, electric plug-ins, candles, oil diffusers) release volatile organic compounds (VOCs) such as benzene and toluene into the air.
Terpenes, which are chemicals often derived from citrus oils are not inherently dangerous, but react with ozone to form formaldehyde.
Many aerosols even those advertised as "all natural" contain phthalates, a dispersant which can alter hormone levels and cause other health problems.

Infrequent use to just show a house may not harm you, but it's still better to use a natural alternative.
(see links below)

Pure essential oils that allow you to put a few drops on a cotton ball, may not be a problem, but you have to be careful that they are really pure. Many are diluted to work in dispensers.

See New Study Finds Scented Candles and Air Fresheners Pose Dangerous Health Risks | WomansDay,
Main Chemicals in Air Fresheners - Main Chemicals in Air Fresheners | HowStuffWorks,
and Essential oil diffusers and asthma | American Academy of Allergy Asthma and Immunology

Many essential oils are not pure and can emit VOCs (volatile organic compounds).
See Essential Oils in products.

If your home is smelling less than fresh, first find the source of any bad odors. Get a friend to sniff because you may be used to it.
Sprinkle some baking soda on your carpets and sofas. Let it sit for 10-15 minutes, and vacuum it up.

A heavy-duty cleaning approach should eliminate minor unwanted odors and introduce a clean, refreshing scent throughout each room.
Empty the garbage, Run lemon or orange rind along with a few ice cubes thru your garbage disposal.
Try using unscented or subtly scented cleaning products — those that are plant-based or eco-friendly and natural can be good choices.
For heavy pet smells, have your carpets and upholstered items professionally steam-cleaned well in advance.

As a rule of thumb, try not to cook with pungent ingredients for four days prior to a showing.

Recommendations from several web sites.

Site	Good	Bad
These Are The Top 4 Scents That Help Homes Sell | DollarScentClub	Citrus, Herbs, Pine or Cedar, Vanilla	Don’t mask smells with other smells.
US News	Citrus,citrus cilantro, rosemary, thyme or basil, vanilla, almond or mint extract, Green Tea, Pine and Cedar	Complex mingled scents
7 scents -US News	Baking Soda to eliminate odors, Vanilla, Citrus, Essential oils - relaxing scents such as lavender or uplifting scents such as grapefruit or satsuma. Pine, Plants
5 scents- US News	sticks of cinnamon, and a few cloves in a pot of water; Allspice, fresh ginger, vanilla and orange peels; hidden, open jars of vanilla extract; lavender or uplifting scents such as grapefruit or satsuma; pine	patchouli, sandalwood or ylang ylang
Houzz	orange, lemon, basil, tea, cedar, pine, vanilla and cinnamon	Don't mix lemon and orange.
Scenting a house for sale Forum	Baking bread, brewing coffee French Vanilla in the living room and hallway, Clean Cotton in the bedrooms and Fresh Cut Roses in the dining room; B&BW vanilla smelled more natural	fake spray air fresheners,
Homes&Land	Orange, Lemon, Pine, Basil, Cedar, Vanilla, Cinnamon	Don't spray a product that claims to neutralize or freshen. The intermingled chocolate and vanilla of fresh-baked chocolate-chip cookies — are distracting. There are too many scents in potpourri.
Realtor Magazine	Lemon, green tea, cedar, pine, basil, and vanilla.	Potpourri, chocolate-chip cookies, gourmet foods, and other baked goods, according to the study

Comments:
5 Scents That Make Sense When Selling a Home | Real Estate | US News
"A clean smell and a deodorized smell are two different things. Pulling out scented candles and plug-ins or preparing baked cookies may smell nice to some, but others may think you’re masking a smell or could find the scent appalling. Even worse, the scent could distract the buyer’s ability to make a decision."

"A study at UC-Irvine, found shoppers spent an average of 32 percent more money in a home decor store when it was scented with a simple orange scent, rather than a blend of scents."

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